Pen cap



FIG. 1 is a front elevational view of a pen cap showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a top, front perspective view thereof.

The broken lines showing the inside of the cap in FIG. 6 are included to show a portion of the pen cap that forms no part of the claimed design. 

CLAIM The ornamental design for a pen cap, as shown and described. 